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Lines 777-812
pipe_rdwr_release(struct inode *inode, struct file *filp)
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| 777 |
static int |
777 |
static int |
| 778 |
pipe_read_open(struct inode *inode, struct file *filp) |
778 |
pipe_read_open(struct inode *inode, struct file *filp) |
| 779 |
{ |
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{ |
| 780 |
/* We could have perhaps used atomic_t, but this and friends |
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int ret = -ENOENT; |
| 781 |
below are the only places. So it doesn't seem worthwhile. */ |
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| 782 |
mutex_lock(&inode->i_mutex); |
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mutex_lock(&inode->i_mutex); |
| 783 |
inode->i_pipe->readers++; |
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784 |
if (inode->i_pipe) { |
| 785 |
ret = 0; |
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inode->i_pipe->readers++; |
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} |
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| 784 |
mutex_unlock(&inode->i_mutex); |
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mutex_unlock(&inode->i_mutex); |
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|
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| 786 |
return 0; |
791 |
return ret; |
| 787 |
} |
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} |
| 788 |
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| 789 |
static int |
794 |
static int |
| 790 |
pipe_write_open(struct inode *inode, struct file *filp) |
795 |
pipe_write_open(struct inode *inode, struct file *filp) |
| 791 |
{ |
796 |
{ |
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int ret = -ENOENT; |
| 798 |
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| 792 |
mutex_lock(&inode->i_mutex); |
799 |
mutex_lock(&inode->i_mutex); |
| 793 |
inode->i_pipe->writers++; |
800 |
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|
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if (inode->i_pipe) { |
| 802 |
ret = 0; |
| 803 |
inode->i_pipe->writers++; |
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} |
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|
| 794 |
mutex_unlock(&inode->i_mutex); |
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mutex_unlock(&inode->i_mutex); |
| 795 |
|
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| 796 |
return 0; |
808 |
return ret; |
| 797 |
} |
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} |
| 798 |
|
810 |
|
| 799 |
static int |
811 |
static int |
| 800 |
pipe_rdwr_open(struct inode *inode, struct file *filp) |
812 |
pipe_rdwr_open(struct inode *inode, struct file *filp) |
| 801 |
{ |
813 |
{ |
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|
814 |
int ret = -ENOENT; |
| 815 |
|
| 802 |
mutex_lock(&inode->i_mutex); |
816 |
mutex_lock(&inode->i_mutex); |
| 803 |
if (filp->f_mode & FMODE_READ) |
817 |
|
| 804 |
inode->i_pipe->readers++; |
818 |
if (inode->i_pipe) { |
| 805 |
if (filp->f_mode & FMODE_WRITE) |
819 |
ret = 0; |
| 806 |
inode->i_pipe->writers++; |
820 |
if (filp->f_mode & FMODE_READ) |
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|
821 |
inode->i_pipe->readers++; |
| 822 |
if (filp->f_mode & FMODE_WRITE) |
| 823 |
inode->i_pipe->writers++; |
| 824 |
} |
| 825 |
|
| 807 |
mutex_unlock(&inode->i_mutex); |
826 |
mutex_unlock(&inode->i_mutex); |
| 808 |
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827 |
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| 809 |
return 0; |
828 |
return ret; |
| 810 |
} |
829 |
} |
| 811 |
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| 812 |
/* |
831 |
/* |
